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In a plant, a cross between homozygous red-flowered (RR) plants and homozygous white-flowered (rr) plants showed a progeny of plants with all pink flowers,

What is this phenomenon known as?

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Important Questions on Inheritance and Variation

EASY
Biology>Genetics and Evolution>Inheritance and Variation>Deviation from Mendelian Ratios
For a particular gene that determines the coat color in a diploid organism, there are three different alleles that are codominant. How many different skin colors are possible in such an organism?
EASY
Biology>Genetics and Evolution>Inheritance and Variation>Deviation from Mendelian Ratios
A man with blood group A marries a woman having blood group. The maximum possible blood groups among their progenies are
EASY
Biology>Genetics and Evolution>Inheritance and Variation>Deviation from Mendelian Ratios
In a cross between true-breeding (homozygous) red-flowered and true-breeding (homozygous) white flowered plants, the F1 progeny was pink. The phenotypic and genotypic ratios in F2 progency were 1:2:1. This is because of:
MEDIUM
Biology>Genetics and Evolution>Inheritance and Variation>Deviation from Mendelian Ratios
If the gene pool of the locus X in the human genome is 4, then what would be the highest possible number of genotypes in a large population?
EASY
Biology>Genetics and Evolution>Inheritance and Variation>Deviation from Mendelian Ratios
A gene showing codominance has
EASY
Biology>Genetics and Evolution>Inheritance and Variation>Deviation from Mendelian Ratios
Which one of the following genetic phenomena is represented by the blood group AB?
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Biology>Genetics and Evolution>Inheritance and Variation>Deviation from Mendelian Ratios
What is the possible genotypic ratio in F2 generation if a plant producing red flowers RR is crossed with another plant of the same species that produces white flowers rr?
EASY
Biology>Genetics and Evolution>Inheritance and Variation>Deviation from Mendelian Ratios
Which one of the following pairs of genotype and phenotype ratios will be obtained in F2 generation for Snapdragon plants exhibiting incomplete dominance for red and white flower color traits?
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Biology>Genetics and Evolution>Inheritance and Variation>Deviation from Mendelian Ratios
In Antirrhinum (Snapdragon), a red flower was crossed with a white flower and in F1 generation, pink flowers were obtained. When pink flowers were selfed, the F2 generation showed white, red and pink flowers. Choose the incorrect statement from the following.
EASY
Biology>Genetics and Evolution>Inheritance and Variation>Deviation from Mendelian Ratios
Identify the wrong statement with reference to the gene ‘I’ that controls ABO blood groups.
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Biology>Genetics and Evolution>Inheritance and Variation>Deviation from Mendelian Ratios

ABO blood type in man is an example of

1. Pleiotropy

2. Incomplete dominance

3. Co-dominance

4. Multiple allelism

Select the code for the correct answer from the options given below:

MEDIUM
Biology>Genetics and Evolution>Inheritance and Variation>Deviation from Mendelian Ratios
The minimum number of plants to be screened to obtain a plant of the genotype AabbCcDd from a cross between plants of genotypes AaBbCcDd and AABbCCDd is:
EASY
Biology>Genetics and Evolution>Inheritance and Variation>Deviation from Mendelian Ratios
In Drosophila, the size of the wings is controlled by _______ number of multiple alleles.
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Biology>Genetics and Evolution>Inheritance and Variation>Deviation from Mendelian Ratios
Match the terms in Column-I with their description in Column-II and choose the correct option:
 
Column – I Column – II
(a) Dominance (i) Many genes govern a single character
(b) Codominance (ii) In a heterozygous organism, only one allele expresses itself
(c) Pleiotropy (iii) In a heterozygous organism, both alleles express themselves fully
(d) Polygenic inheritance (iv) A single gene influences many characters
EASY
Biology>Genetics and Evolution>Inheritance and Variation>Deviation from Mendelian Ratios
How many types of gametes can be produced by individual with the genotype AAbb?
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Biology>Genetics and Evolution>Inheritance and Variation>Deviation from Mendelian Ratios

Assertion (A) : If the allele produces a less functional enzyme or non-functional enzyme the phenotype may be affected.
Reason (R) : The phenotype trait will not be dependent on the functioning of the unmodified allele.

The correct option among the following is:

EASY
Biology>Genetics and Evolution>Inheritance and Variation>Deviation from Mendelian Ratios
The production of gametes by the parents, formation of zygotes, the F1 and F2  plants, can be understood from a diagram called:
MEDIUM
Biology>Genetics and Evolution>Inheritance and Variation>Deviation from Mendelian Ratios
In human beings, brown eye (B) is dominant over blue eye (b). A brown-eyed couple has a blue-eyed child. What are the possible genotypes of the couple?
HARD
Biology>Genetics and Evolution>Inheritance and Variation>Deviation from Mendelian Ratios
When a pure bred, red flower-producing plant of genotype RR is crossed with a pure bred, white flower-producing plant of genotype rr, all the F1 plants produced pink flowers if all the plants in each generation from F1 to F6 are selfed, what will be the percentage of plants with red and white flowers in the final population consisting of a large number of individuals? (Consider that flower colour has no effect on reproduction and survival.)
EASY
Biology>Genetics and Evolution>Inheritance and Variation>Deviation from Mendelian Ratios
A tall true breeding garden pea plant is crossed with a dwarf true breeding garden pea plant. When the F1 plants were selfed the resulting genotypes were in the ratio